Abrasive strip clamping device for sanding wheels



Dec. 13, 1955 H. G. cLAUslNG 2,726,496

ABRASIVE STRIP CLAMPING DEVICE FOR SANDING WHEELS Filed Oct. 20, 1954 United States Patent Oiiice ABRASIVE STRIP CLAMPING DEVICE FOR SANDING WHEELS Henry G. Clausing, Portsmouth, Ohio, assignor to. Vulcan Corporation, Portsmouth, Ohio, a corporation of Ohio Application, October 20, 195,4, Serial No. 463,460

' 4 Claims. (ci. 51-194) This invention` relates tov an improved clamping device for securing an. abrasive strip to the working peripheral face of a sanding wheel, or the like.

An object of the invention is to provide a clamping device which grips the opposed endsL of the abrasive strip and at the same time pulls up on saidy ends so thatl the abrasive strip. forms. an abrasive band that is tightly secured inposition. on. the peripheral face of the wheel.

Another object of the, invention is to provide a clamping device for a sanding wheel that has a few simple parts which may be counterbalanced on the wheel by a small counter-weight and which may be easily adjusted for replacement of the abrasive strip or for tightening the same on the wheel during use.

With these and other objects in view the invention consists in certain constructions and arrangements of parts that shall be hereinafter fully described and pointed out in the appended claims.

In the accompanying drawings which illustrate the preferred embodiment of my invention:

Fig. l is a front elevational view of a sanding wheel provided with the clamping device of this invention.

Fig. 2 is an enlarged section taken on line 2 2 of Fig. l.

Fig. 3 is a section taken on line 3 3 of Fig. 2 showing a detail of this invention.

With reference to the drawing the numeral 6 indicates the usual sanding wheel conventionally mounted on a rotatable spindle 7 by a nut 8 cooperating with the threaded, reduced end 9 of the spindle which passes through a hub 10 of the wheel. The sanding wheel has a circular web 11 formed concentric on the hub which is provided with an annular flange 12 projecting at right angles from one side of the periphery thereof. As best shown in Figs. l and 2 the flange has a longitudinal slot 13 formed therethrough; the working face of the auge carrying a relatively thick cushion 14 that terminates on each side of the slot and has rounded tapering ends 15 and 16 forming a relatively wide entrant mouth leading from the periphery of the cushion to the slot 13. A strip 17 having an exposed abrasive surface 18 surrounds the cushion 14 and has its end portions 19 and 20 turned inwardly through the slot, the terminal portions of the strip meeting in face-to-face relationship interiorly of the flange 12.

The clamping device of this invention is generally indicated by the reference numeral 21 and comprises a pair of laterally opposed abutments in the form of pins 22 and 23 anchored in, and extending at right angles from the web 11 and positioned near the ange 12 on opposite sides of the radially extending center line of the slot 13. A pair of cooperating jaw members 24 and 25 are mounted on the wheel between the pins 22 and 23 for radial movement toward and away from the slot 13 in the flange 12, the outer end of each member having a short, inturned extension 26 and 27, respectively, for engaging the contacting terminal end portions of the abrasive strip 17. As best shown in Fig. 3 the inner ends of the jaw members 24 and 25 are turned toward one another and are provided Patented Dec. 13,v 195.5

2. with alternating, interfitting lingers 28r and 29, respite: tively, that form a hinge connection for the jaw members.,

With reference to Fig. 1 it will be noted that. thegouter face of each jaw member 24 and 25 is provided with an inclined, pin engaging portion 30 and 31, respectively, which cooperate with the pins as the jaw membergis moved radially inwardly to function as a wedge to close. the'jaw, members upon the ends of the strip and thuspositively secure the ends to the member..

`The means for moving the` jaw member isv shown in, the drawing as: an externally threaded shaft 32 mounted for axial. movement on the radius of the wheel. by a block 33 anchored tothe web 11 and having. a threadedrbore, which, cooperates with external threads on4 the said shaft. The outer end of the shaft freely passes through. a hole- 34 formed in the hinged connection of the jaw members 24 and 25, said` jaw members being secured against radial. displacement thereonby a shoulder 35. on the shaft. disposed on, the interior side,v of the hinge, connection anda washer 36 fixed to the shaft on the outside end oi the; shaft. As illustrated in Fig. 3 this washer 36 has alaterall extent suiicientV to extend over the interiitting fingers 2 8. and: 29 of both jaw members 24` and. 25` to the end that both members will be engaged by the washer at the hinge. The inner end of the shaft is provided with a knurled hand wheel 37 which may extend into a clearance slot 38 formed in the web 11. A small counter-weight 39 is located on the wheel diametrically opposite the clamping device 21 to maintain the balance of the wheel.

In operation let us suppose that the clamping device 21 is in its fully projected inoperative position with the pins 22 and 23 located in the innermost, deepest portions of the inclined portions 30 and 31, respectively, of the jaw members. The jaw members will then be spaced apart in position to receive the opposed engaged ends 19 and 20 of the abrasive strip 17. By turning the knurled hand wheel 37 the threaded shaft 32 is turned in the block 33 thus moving the jaw members radially inwardly, the initial movement of the members bringing their inward extensions 26 and 27 into clamping engagement with the strip ends by reason of the wedging action created by the inclined portions 30 and 31 and the abutments 22 and 23 respectively. Further inward movement of the jaw members serves to progressively tighten the jaw members on the strip ends whilst pulling the strip with increasing tightness around the cushion 14 until the desired working tension on the strip is reached. rIf during operation the strip becomes loose on the wheel it can be tightened to the desired tension by rotating the hand wheel. In some instances the strip may be loosened on the cushion for certain types of work by turning the hand wheel in the opposite direction.

What is claimed is:

l. In a device for securing an abrading strip to the peripheral working face of a sanding wheel having an annular flange with a longitudinal slot therein for receiving the engaged end portions of the strip, the combination of a pair of abutments xed on the wheel inwardly from the slot and positioned on opposite sides of the radial center line of said slot, a pair of jaw members having their outer ends engaged with the ends of the strip, the inner ends of the said jaw members being formed with alternating, intertting ngers that form a hinge connection for the members, an inclined outer face portion on each jaw member and each portion having sliding contact with its respective abutment upon radial movement of the members with respect to the slot and cooperable to move the jaws into gripping relationship with the strip ends upon inward movement of the members, a threaded shaft mounted for axial movement on the radius of the wheel, a block anchored to the web and threadedly receiving an intermediate portion of the shaft, a hand wheel fixed on the inner end of the shaft, and an operable connection between the outer enclV of the shaft and the hinge connection of the jaw members.

2. In a device as set forth in` claim 1 characterized bythe factAthat thejaw members have substantially parallel outer 'faces when'the jaw members are in gripping engagement with` the strip ends.

"3.41m a` device as set forth in claim 1 characterized by the fact that the operable connection between the outer end of the shaft and the hinge connection of the jaw members comprises'a hole formed in the connection for freely receiving the shaft end, and a pair of shoulders fixed on` the shaft on opposite sides of the connection, each shoulder having an extended area adapted to t over the intertting ngers of the connection.

4. In a device for securing an abrading strip to the peripheral working face of a sanding wheel having an annular ange with a longitudinal slot therein for receiving the engaged end portion of the strip, the combination of a pair ,ofabutments fixed on the wheel inwardly from the slot and` positioned on opposite sides of the radial center line of said slot, a pair of jaw members having their outer ends engaged with the ends of the strip, the inner ends of the said jaw members being formed with alternating, intertting ngers that form a hinge connection for the members, an inclined outer face portion on each jaw member and each portion having sliding contact with its respective abutment upon radial movement of the members with respect to the slot and cooperable to pivot the jaw members on the hinge connecton and move the outer ends of said jaw members into gripping relationship with the strip ends upon inward movement of the members, a threaded shaft mounted for axial movement on the radius of the wheel, a block anchored to the web and threadedly receiving an intermediate portion of the shaft, a hand wheel xed on the inner end of the shaft, and an operable connection between the outer end of the shaft and the hinge connection of the jaw members.

References Cited in the le of this patent UNITED STATES PATENTS 

